I managed to find a 60 Gallon tank, but...

Looking at the "Land Hermit Crab Care Guide" on the substrate section, it says I need Play sand, Coco fiber and drainage components. What are these? I tried to look this term up but most articles that I found were for potted plants and had nothing to do with animal care, even when I specified the search.

Can someone please enlighten me on what this means?

Also, the tank is second hand. It has a bit of sand in it and a salty smell, so I'll have to clean it. Should wiping it down with boiled water and a rag be sufficient, or should I use something more?